CVE-2025-21333 Overview
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability allows attackers to gain elevated privileges through a vulnerability in the Windows Hyper-V system.
Critical Impact
This vulnerability allows local attackers to escalate privileges, potentially compromising affected systems.
Affected Products
- Microsoft Windows 10 21H2
- Microsoft Windows 10 22H2
- Microsoft Windows 11 22H2
Discovery Timeline
- Unknown - Vulnerability discovered by Not Available
- Unknown - Responsible disclosure to Microsoft
- Unknown - CVE CVE-2025-21333 assigned
- Unknown - Microsoft releases security patch
- 2025-01-14T18:15:58.530 - CVE CVE-2025-21333 published to NVD
- 2025-11-03T15:08:08.450 - Last updated in NVD database
Technical Details for CVE-2025-21333
Vulnerability Analysis
This vulnerability exploits a weakness in the Hyper-V NT Kernel’s integration with the virtual service provider (VSP) interface, allowing an attacker to execute privileged commands locally.
Root Cause
An out-of-bounds write in the NT Kernel due to improper input validation, leading to privilege escalation.
Attack Vector
The attacker must have local access to the affected system to exploit this vulnerability through crafted command inputs.
# Example exploitation code (sanitized)
& { Write-Host "Exploiting CVE-2025-21333..." }
Detection Methods for CVE-2025-21333
Indicators of Compromise
- Unexpected privileged process executions
- Anomalies in system logs indicating privilege changes
- Unknown scheduled tasks or services
Detection Strategies
Utilize EDR solutions to monitor for abnormal privilege escalation patterns. SentinelOne solutions can detect anomalies in process creation and privilege elevation.
Monitoring Recommendations
Set alerts for the creation of unexpected privileged processes and privilege changes in system logs.
How to Mitigate CVE-2025-21333
Immediate Actions Required
- Apply the latest security patch from Microsoft
- Monitor for unexplained privilege escalations
- Utilize SentinelOne’s real-time threat detection capabilities
Patch Information
Patches are available at the Microsoft Update Guide: Microsoft Patch
Workarounds
While patching is the recommended solution, temporarily disabling Hyper-V features not in use can mitigate risk.
# Configuration example
dism.exe /Online /Disable-Feature /FeatureName:Microsoft-Hyper-V
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
